Microsoft Internet Explorer 9 and 10 Use-After-Free Remote Code Execution Vulnerability (CVE-2014-0322)
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft Internet Explorer 9 and 10 browsers
Remote attackers can execute arbitrary code with user privileges when a victim visits a specially crafted webpage
Apply official cumulative security updates, disable Internet Explorer, and migrate to modern secure browsers
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Microsoft released cumulative security updates (such as MS14-012) to address this vulnerability. Since Internet Explorer is officially retired, organizations must disable IE and transition to modern browsers like Microsoft Edge.
To disable Internet Explorer via PowerShell on Windows clients:
# Disable Internet Explorer optional feature (Requires Administrator privileges)
Disable-WindowsOptionalFeature -Online -FeatureName 'Internet-Explorer-Optional-amd64' -NoRestart2. Temporary Workaround & Hardening Configuration
If immediate migration is not feasible, restrict Active Scripting in the Internet Zone or deploy security mitigation tools to prevent heap spraying and memory exploitation.
To disable Active Scripting in the Internet Zone via Registry:
# Set Active Scripting to 'Disable' (value 3) for the Internet Zone (Zone 3)
Set-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3' -Name '1400' -Value 33. Log Audit & IoC Verification Commands
Verify the version of mshtml.dll on endpoints to identify if vulnerable versions of Internet Explorer are still present:
# Check the file version of mshtml.dll
$mshtmlPath = 'C:\Windows\System32\mshtml.dll'
if (Test-Path $mshtmlPath) {
$fileVersion = (Get-Item $mshtmlPath).VersionInfo.FileVersion
Write-Output "Detected mshtml.dll Version: $fileVersion"
}Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2014-0322) is a Use-After-Free (UAF) memory corruption flaw within the HTML rendering engine (mshtml.dll) of Microsoft Internet Explorer 9 and 10. The root cause lies in the improper lifecycle management of the CMarkup object when processing specific JavaScript code associated with the onpropertychange attribute of a script element.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by hosting a malicious website and leveraging watering hole attack vectors.
- The exploit code uses JavaScript to trigger the
onpropertychangeevent handler, forcing the release of theCMarkupobject from memory while retaining a reference to it. - The attacker then performs heap spraying or precise memory allocation to occupy the freed memory space with attacker-controlled data.
- When the browser attempts to reuse the dangling pointer to the
CMarkupobject, it references the attacker's fake virtual function table (vtable), hijacking the execution flow to run arbitrary shellcode.
3. Infrastructure & Business Impact
This vulnerability was actively exploited in the wild in early 2014, targeting high-profile organizations including French aerospace entities. Successful exploitation grants the attacker the same privileges as the active user, potentially leading to full system compromise, lateral movement within the corporate network, and sensitive data exfiltration.
Official Vendor Advisories & References
Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via vectors involving crafted JavaScript code, CMarkup, and the onpropertychange attribute of a script element, as exploited in the wild in January and February 2014.
Frequently Asked SecOps Questions (CVE-2014-0322)
FAQQ1. How critical is CVE-2014-0322 and is it actively exploited in the wild?
CVE-2014-0322 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 85.1%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2014-0322?
Primary impacted vendors include microsoft across internet_explorer. Scope summary: Microsoft Internet Explorer versions 9 and 10 running on supported Windows operating systems
Q3. What temporary mitigations or workarounds exist for CVE-2014-0322 before patching?
[Mitigation] Apply official cumulative security updates, disable Internet Explorer, and migrate to modern secure browsers Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2014-0322
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